Equatorial adapter for transits.



C. L. BERGER.

EUUATOHlAL ADAPTER FOR TBANSITS. (Apphcahon led Feb 19, 1901 (llo Modal.)

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UNITED STATES PATENT OEEICE.

CHRISTIAN L. BERGER, OF BOSTON, MASSACHUSETTS.

EQUATORIAL ADAPTER FOR TRANSITS.

`S1"ECIFIGATIION forming part of Letters Patent No. 672,886, dated April 30, 1901. Application filed :Eelxruaryv 19, 1901. Serial No. 47,988. (No model.)

To all whom t may concern.-

Beit known that I, CHRISTIAN L. BERGER,

avctizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Equatorial Adapters for Transits, of which the following description, in connection with the accompanying drawings,is a specification, like letters on the drawings representing like parts.

My present invention is an improved equatorial adapter particularly intended for use in connection with mining-transits.

In my copending application, Serial No. 737,267, filed November 17, 1899, Ihave fully explained the purposes and general operation of what I term an equatorial adapter,7 and therefore I will not go into the technical details thereof in this case. In this class of instruments, in which there is a main telescope and a superposed auxiliary telescope, it is essential for the greatest accuracy that the auxiliary telescope should be capable of having a movement strictly parallel to the plane including the main telescope and its transverse axis for the purpose of bringing the two telescopes into perfect alinement with each other; but heretofore the nearest approach to such adjustment has been a swinging adjustment, such as is shown in my aforesaid application, and accordingly the main feature of my present invention relates to provisional means for moving or shifting the auxiliary telescope laterally in a plane parallel to the plane of the main telescope.

The constructional details of my invention will be pointed out in the course of the following description, reference being had to the accompanying drawings,in which I have illustrated one form of my invention.

In the drawings, Figure 1 is a fragmentary view of a sufficient portion of a eld instrument to render my invention readily understood. Fig. 2 is ak front elevation thereof. Fig. 3 is a similar view of a modified construction. Fig. 4 is an enlarged detail showing in elevation the special means for securing the adjustment desired. Fig. 5 is a sectional view thereof, taken on the line 5 5, Fig. 4. Fig. 6 is a sectional detail of the level.

The general form of apparatus to which I have applied 'my invention is a miningtransit comprising standards a, in which is mounted on a horizontal axis a a main telescope a2, carrying an auxiliary telescope a3, supported on a post a4 thereof and adapted to be mounted on the ends a5 of the main-telescope axis, as more fully explainedin my Patent No. 559,117, dated April 28, `1896. As shown in Figs. 1 and 2, the post f1.4 carries a trivet adjustment a6, on the upper plate of which opposite arms, constituting a Y-support a7, are adjustably mounted, being provided with a slow-motion adjustment a8 and ra clamping adjustment a9 of the same kind Which is commonly provided for ordinary transits. The auxiliary telescope has a clamping-arm d10 mounted on its pivotal axis a1?, adapted to be clamped or released by the set thumb-screw @13 and having opposite adj usting-screws L14 for coarse and iine adjustments. At its opposite ends the axis a12 has conical recesses @15, which receive conical bearings 0.16, preferably7 threaded, as shown in Fig. 4, and mounted in the ends of the Y-support a7, said ends being provided with clamping means,herein shown as consisting of split ends a1?, to be clamped together by a set-screw Q18. By means of this simple construction the auxiliary telescope a3 may be shifted accurately one Way or the other simply by tightening the bearing a16 at one end of the axis L12 and loosening the opposite bearing 116 at the other end of said axis, and when the precise adjustment required has been obtained the two bearings a16 are clamped immovably by the set-screws 0.18, so as to maintain the said adjustment without possibility of change. For some kinds of Work it is also desirable that the entire adapter (the adapter consisting of all the mechanism carried on the post a1) should be capable of lateral adjustment in a plane parallel to the plane of the main telescope, and accordingly I provide, instead of the post construction shown in Figs. 1 and 2, opposite arms 0.19, constituting su bstantiallya Ysupport,which contain at their upper ends bearings L20 and clamping devices am, the same in construction and operation as kthe bearings @16 and clamping devices w18, and on these bearings I mount a transverse axis 122, provided. with a post 0023, the same in construction and function as the post a4, and on this post @23 are mounted the parts of the IOO adapter, the same as already described. The axis @22 is provided with a clamping-arm @24,

a clamping-screw (L25, and ad justin g-screw 0.26,.

in construction the same as the similar parts 0.10 a13 al?, already described.

In connection with the foregoing apparatus I employ a special level for the purpose of correcting errors and ascertaining when the adjustments are correct, said level being indicated at (127 and being of the revolving type, adjustably mounted at its ends 0,28 and capable of revolving in arms (1,29, which are themselves adjustably secured on the axis d of the main telescope, being clamped thereon by set-screws aso, as herein shown, the result being that the line of collimation may be accurately determined in any situation, the arms a2 being adjustable, and therefore permitting the level to be turned into any position--as, for instance, into the dotted-line position, Fig. l, in which case, as will be readily understood, the level itself is rotated so as to bring the bubble uppermost.

In use the auxiliary telescope of the adapter is brought into level position by means of the trivets aG and is then turned into approximate alinement with the main telescope by means of the clamp and adjustments a8 a9. If the auxiliary telescope should not then lie in the vertical plane, including the vertical axis of the Y-support a7, it is shifted horizontally by means of the conical bearings o16 and clamps als. When brought into accurate alinement with its own vertical axis, however, it may be discovered that the entire adapter, from the trivets up, is not in the same vertical plane with the longitudinal axis of the main telescope, and accordingly the entire mechanism is shifted horizontally by means of the bearings d20 and clamps @21.

The result of the above-described mechanism is that in use the utmost precision and reliability may be secured.

The several bearing adjustments will usually be of most use to the manufacturer in adjusting the instrument at the works prior to sending it out.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a surveyinginstrument having a main telescope and an auxiliary telescope, means for adjusting said auxiliary telescope laterally in a plane parallel to the plane including the main telescope and its lateral axis.

2. In asurveying instrument having a main telescope and an auxiliary telescope, means for adjusting said auxiliary telescope laterally in a plane parallel to the planeincluding the main telescope and its lateral axis, said means including opposite arms having at their upper ends conical bearings longitudinally adjustable, and the adjacent axis having conical recesses fitting on and supported by said conical bearings, whereby the auxiliary telescope maybe shifted by moving one of said conical bearings inwardly, and simultaneously moving the other conical bearing outwardly, in their respective arms.

3. In asurveyinginstrument havinga main telescope and an auxiliary telescope, means for adj ustin g said auxiliary telescope laterally in a plane parallel to the plane including the main telescope and its lateral axis, said means including opposite arms having at their upper ends conical bearings longitudinally adjustable, the adjacent axis having conical recesses fitting on and supported by said conical bearings, whereby the auxiliary telescope may be shifted by moving one of said conical bearings inwardly, and simultaneously moving the other conical bearing outwardly, in their respective arms, and clamps for clamping said bearings in adjustment.

4. In a surveyinginstrument having a main telescope and an auxiliary telescope mounted above said main telescope and moving therewith, a vertical axis supporting said auxiliary telescope, and a horizontal axis for said auxiliary telescope carried by said vertical axis, means for shifting the said horizontal axis laterally relatively to said vertical axis in a plane parallel to the pivotal axis of the main telescope, and means for also shifting said vertical axis in a plane parallel to said main telescopev and its pivotal axis.

5. In a surveying instrument, a main telescope having a horizontal pivotal axis, arms extending rigidly therefrom to constitute a Y-support, an axis mounted in said arms, said axis having conical recesses at its ends, and said arms being provided with longitudinally-adjustable conical bearings iitting in said recesses, a trivet adjustment mounted on the said axis mounted in said Y- support, a vertical axis carried rigidly by the upper side of said trivet adjustment, a second Y- support mounted on said vertical axis, and an auxiliary telescope mounted in said second Y-support.

6. In a surveying instrument, a main telescope having a horizontal pivotal axis, arms extending rigidly therefrom to constitute a Y-support, an axis mounted in said arms, said axis having conical recesses at its ends, and said arms being provided with longitudinally-adjustable conical bearings fitting in said recesses, a trivet adjustment mounted on the said axis mounted in said Y- support, a vertical axis carried rigidly by the upper side of said trivet adjustment, a second Y- support mounted on said vertical axis, an auxiliary telescope mounted in said second Y- support, said auxiliary telescope having a lateral pivotal axis provided at its ends with -conical recesses, and pivotal bearings longitudinally adjustable in said second Y-support and in engagement with said conical recesses of the axis of said auxiliary telescope.

7. In a surveying instrument, a main telescope having a horizontal pivotal axis, arms extending rigidly therefrom to constitute a Y- support, an axis mounted in said arms, said axis having conical recesses at its ends,

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and said arms being provided with longitudinally-adjustable conical bearings fitting in said recesses, a trivet adjustment mounted on the said axis mounted in said Y- support, a vertical axis carried rigidly by the upper side of said trivet adjustment, a second Y- support mounted on said vertical axis, an auxiliary telescope mounted in said second Ysupport,dependingar1nsadjustablymount- 

